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  • Corundum - Mines N Minerals

    The extreme hardness of corundum makes it especially useful as an abrasive. Crushed corundum is processed to remove impurities and then screened to...

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  • Emery (rock) - Wikipedia

    Emery (or corundite) is a dark granular rock used to make abrasive powder. It largely consists of the mineral corundum (aluminium oxide), mixed with ... Crushed or naturally eroded emery (known as black sand) is used as an abrasive — for...

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  • Corundum: The mineral Corundum, Sapphire, Ruby info & pictures

    Corundum is best known for its gem varieties, Ruby and Sapphire. ... Some dark blue stones from certain localities may also be made a bright blue desirable...

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  • What are some uses for Ruby (stone)? - Quora

    Precious stones are valued because they look pretty and are rare. If diamonds were as ... Why are there crushed stones alongside rail tracks? How develop road ... A transparent, gem-quality corundum in any other color is called sapphire.

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  • Ruby & Sapphire Heat Treatment

    Mar 7, 2013 ... ruby, rubies, sapphire, sapphires, Ruby, Sapphire, stone, stones, ... People take pebbles from the earth and crush and compress them into a...

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  • CORUNDUM

    Corundum-bearing rocks in the United States Continued. Page. Corundum in ..... Emery and corundum wheels and stones adapted for all kinds of abrasive work.

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  • The Most Important Uses of the Mineral Sapphire

    Known as the stone of prosperity, the sapphire is capable of alleviating ... The crushed corundum can then be used to manufacture materials such as sand paper...

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  • Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com

    Corundum is used as a gemstone, abrasive, refractory and much more. ... Crushed corundum is processed to remove impurities and then screened to produce ... Emery stone is a granular metamorphic or igneous rock that is rich in corundum.

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  • Corundum - Wikipedia

    Corundum is a crystalline form of aluminium oxide (Al 2O 3) typically containing traces of iron, ... In 1877 Frenic and Freil made crystal corundum from which small stones could be cut. Frimy and Auguste Verneuil manufactured artificial ruby by...

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  • On the Corundum Stone from Asia — Pala international

    ... it was carried up and crushed to pieces, with great force, by the iron crow. Among these broken lumps, the Corundum stone is found; but in many of the pieces...

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